Hydraulic drill.



PATENTED MAY 21,11901' J. CHARLTON.

HYDRAULIC DRILL. A

APPLIOAT ION FILED MAY 5, 1905.

UNITED STATES PATENT OFFICE.

JAMES CHARLTON, OF HOUSTON, TEXAS.

HYDRAULIC. DRILL.

To all whmn itvnrty concern: I

Be it known that I, JAMES CHARLTON, citizen of the United States, residing at Houston, in the county of Harris and State of Texas, have invented new and useful Improvements in Hydraulic Drills, of which the ollowing is a specification.

My invention relates to improvements in what may be termed hydraulic drills.

Objects of the invention are. to provide for the ready insertion and locking in place of the bits or cutters, and their equally ready renewal when required; and to carry out these objects in a simple and effective manner.

Said invention consists of certain structural details, including the combine and.

. arrangement of parts substantially as hereinafter fully disclosed and particularly specified.

ln'the accompanying drawing illustrating the' preferred form of my inventionFigure 1 is a perspective view thereof. Fig. .2 is a disassembled perspective view of one of the .cutters. Fig; 3. is a like view of the cutterlocking core or wedge. Fig. 4 is a vertical section of the tool. Fig. 5 is an inverted view' of the bit holder. Fig. 6 is a detailed' side' elevation of one 01 the bits, showingits u per flared. end.

In the disc osure of my invention, I provide a tubular drill-head 1, having, as adjunctive or arms of a contracted continuation 1*, of its interior surface, a number of radial slots 1 the upper ends of which terminate in downward-facing shoulders I and arealso flared upward, the purpose of which will be presently apparent.

Anumber of bits or cutters 2, effective for their intended purpose, are formed with upward flared extensions 2 rectangular in cross-section, each having .i ts outer rightlined vertical edge 2 set inward a suitable distance, with its base 2 sloping downward and outward and en a ing a corresponding surface or bevel l o thedrill-head l. The inner opposite edge 2 of said upward extension is slightly inclined downward and inward, terminating preferably into a more gradual inclination 2, forming an obtuse angle at that point.

Specification of Letters Patent. Application filed May 5. 1905. Serial No. 259,064.

A wedge or core 3, somewhat conical or tapered downward, with its tapering portion 3 interposed between, and engaging the upward extensions 2 of the cutters or.

bits 2, thus wedging or locking in place the Patented May 21, 1907.

latter dpreviously inserted into -the radial upwar It is observed that by means of this-tin i vention the bits or cutters may be readily.

flared slots 1 of the drill-head 1, said; core or wedge 3 being provided Withfanj a exterior upper end screw-threaded surfacef 1 ;1 3- engaging a corresponding interior'screw-'* threaded surface 1 of said drill-headythus inserted and effectively lockedin place,"and as readily be removed when requiring Te:

newal, as is apparent.

Other advantages of my invention velop themselves in the practical use thereof.

I claim:

l. A tool of the character described, comprising a tubular drill-head having a radial slot therein with its upper end formed by a downward-facing shoulder, a cutter or bit having its upper end portion tapered or narrowed upward along 1ts edges and flared upward laterally, and let into said slot, and a core having connection with said drill-head and effectivefor aiding the retention of said bit 'br cutter in place.

2. A tool of the character described, comprising a tubular drill-head having a radial slot therein with its upper end formed by a downward-facing shoulder, a cutter or hit having its upper end-portion tapered or narrowed upward along its edges and flared upward laterally and let into said slot and a core having screw-threaded connection with said drill-head and tapered downward for engagement with said tapered upper edges of said hits or cutters.

3. A tool of the character described, comprising a tubular drill-head having radial l i ii In testimony whereof I afiix my signature, 1n presence of two subscribing witnesses.-

JAMES CHARLTON.

Witnesses:

J. B. COGHRAN, O. L. 'OOCHRAN, Jr. 

